Magnitsky was arrested on tax evasion charges in November 2008, just days after accusing police investigators in a $230-million tax refund fraud, and died after almost a year in the Matrosskaya Tishina pre-trial detention center in Moscow.

A probe into his death revealed that the lawyer, who was suffering from untreated pancreatitis and a heart condition, did not receive proper medical treatment. Rights activists pointed to multiple violations of the lawyer’s rights during his arrest and detention, including signs that he was beaten by prison guards hours before his death.

The U.S. State Department imposed visa bans on several dozen Russian officials in connection to the Magnitsky case in July 2011. In response, Russia has imposed travel bans on several U.S. officials.